My client's lan includes two soho routers, one of which is a Cisco RV042 and the other of which just died. Each of those routers was connected to an ISP provided router (Cisco IAD series) which presents to the company's T1.
Most of the workstations use the RV042 for a gateway. A few machines point to the now-failed soho router.
I don't really want to replace the old soho router and would prefer that all of the machines used the same soho router for a gateway to the Internet.
The problem is that machines that point to the broken soho router are all part of a busted Windows Server domain that now has no server to handle authentication. It is impossible to get admin privileges on these machines. Technician toolkit programs that wack the sam or whatever to handle lost administrative passwords only work on non-domain machines.
I have several linux boxes on this lan and it seems like it shouldn't be too difficult to configure one of those boxes to use iptables to masquerade as the broken gateway device and forward the packets to the single remaining gateway. This would be a temporary measure until I could get rid of those windows workstations for good.
This is a legacy network that I am converting over to pure linux servers and workstations.
Can anyone out there shed some light on how this might be done?
SOHO ROUTER - NOT BROKEN
wan: xxx.xxx.37.17 lan: 192.168.0.1
SOHO Router - BROKEN
wan: xxx.xxx.37.18 lan: 192.168.0.2